<html><head><title>Blob iframe test</title></head>
<body>
<script>
  let f = document.createElement("iframe");
  f.name = "blob_iframe";
  document.body.appendChild(f);
  let blob = new Blob(['foo'], {type : 'text/html'});
  f.src = URL.createObjectURL(blob);
</script>
</body></html>
